Solids based on polyisocyanurate polymers produced under adiabatic conditions

US10590226B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Mathias Matner · Neuss, DE
• Dirk Achten · Leverkusen, DE
• Hans-Josef Laas · Odenthal, DE
• Heiko Hocke · Shanghai, CN
• Dieter Mager · Leverkusen, DE

Key dates

• Filing date: Apr 21, 2016
• Grant date: Mar 17, 2020
• Expiry date: Jul 15, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/792
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for producing solids made from polyisocyanurate plastics, comprising the following steps: (a) providing a polyisocyanate composition A) which contains oligomeric polyisocyanates and is low in monomeric polyisocyanates, where the isocyanurate structure content in the polyisocyanate composition A) is at least 50 mol %, based on the sum total of the oligomeric structures from the group consisting of uretdione, isocyanurate, allophanate, biuret, iminooxadiazinedione and oxadiazinetrione structure that are present in the polyisocyanate composition A); (b) catalytically trimerizing the polyisocyanate composition A), where (i) the catalytic trimerization is conducted at ambient temperatures of at least 80° C.; (ii) the catalytic trimerization is conducted within less than 2 hours at least up to a conversion level at which only at most 20% of the isocyanate groups originally present in the polyisocyanate composition A) are present; (iii) the catalytic trimerization takes place under quasi-adiabatic conditions which are characterized in that the material temperature at least one juncture is at least 10° C. above ambient temperature. The invention further r…